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The fuse rating is expressed in terms of

kVA
current
VAR
voltage

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The time of closing the cycle, in modern circuit breakers is

0.001 sec
0.01 sec
0.003 sec
0.10 sec

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In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as

lead time
operation time
lag time
clearing time

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The information to the circuit breaker under fault conditions is provided by

rewirable fuse
relay
H.R.'only
All of these

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The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to

insulate the contacts from switch body
lubricate the contacts
All of these
extinguish the arc
None of these

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Air blast circuit breaker is used for

intermittent duty
short duty
over currents
repeated duty

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